<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>布局</title>
<style type="text/css">
body{ margin:0; padding:0; font-size:30px; color:#fff}
.top{width: 100%;height:100px;background:#951;}
.main{height:600px;background:#bbb;}
.left{width:300px;height:600px;background:#aab;position:absolute;left:0;top: 100px;}
.right{height:600px;background:#bca;margin-left:310px;}
.foot{width: 100%;height:100px;background:#951;clear:both;}
</style>

</head>

<body>
<div class="top">top</div>
<div class="main">
    <div class="right">right</div>
    <div class="left">left</div>
</div>
<div class="foot">foot</div>

</body>
</html>